AFM is better as you still have flow of air at idle - not that I would choose AFM. 100kw ECU is my pick.
With big cams there is no vacuum for the MAP sensor to pick up at idle.

Plenty of people have run 272's on stock ECU. Billzilla has a audio file of I think 288's, and indeed sounds like a rotor and sounds much like my car when I had 272's on stock cam wheels.

Tho depending on how you set the lobe centres, you could run 288's on standard ECU but really you should have gone aftermarket ECU/emanage with cams that big.

AS for lift: GENERALLY SPEAKING: always think of aftermarket cams like this: under 288, 8.35mm lift is fine. over 288, you gain from more lift. A pair of 264 w/ 10mm lift (meaning you have converted to underbucket shims) is a waste of money - unless its turbo